Controlling mechanism fob agricul



T. BROWN Feb. 10, 1942.

CONTROLLING MECHANISM FOR AGRICULTURAL mrmunu'rs Original Filed Sept.30. .1939 4 Sheets-Sheet 1 regardless of movement of both Reiasued Feb.10, 1942 CONTROLLING MECHANISM FOR AGRICUL- TUBA!- IMPLEMENTS TheophilusBrown, Moline,

. 8: Company, Mollne, 111.,

Illinois Original No. 2,249,807,

for reissue September 26, 1941,

56 Claims.

The present invention relates generally to agricultural implements andmore particularly to tractor mounted tools of the ground working typesuch .as plows, listers and the like. More particularly, the presentinvention is concerned with agricultural machines in which the depth ofoperation of the tool or tools is controlled by a gauge wheel and inwhich the tractor is provided with power lift mechanism for raising thetools into transport position.

The object and general natureof this invention is the provision of meanscontrolled by the tractor power lift mechanism for controlling theworking depth of the tool. Heretofore, so far as I am aware, the tractorpower lift mechanism has been employed solely to raise the tool intotransport position or lower it into working position. A feature of thisinvention-is the provision of an agricultural machine having power liftmechanism so connected with the implement gauging means that the firstor initial range of raising movement serves to raise the tool or toolsrelative 'to the gauge wheel while the remaining raising movement of thepower lift mechanism serves to raise or lift both the tool and thegauging means out of contact with the ground. More spe- IlL, assignor toDeere a corporation of dated July 22, 1941, Serial No. 297,330,September 30, 1939. Application Serial No.

cifically, the present inventionhas for its object the provision ofmeans for controlling the depth of implement tool means by means of apower lift mechanism of the double acting hydraulic type which can bemoved to and locked in any intermediate position as well as in acompletely raised orcompletely lowered position, and in this connectionit is a further feature of the present invention to employ a .hydraulicdouble acting power lift so that the'lower part of the lift is used to'control the depth while the upper part of the lift is utilized forraising the implement into its transport position.

Another feature of the present invention is the provision of means forcontrolling the depth of an integral implement. such as a plow, by meansof the tractor power lift mechanism"which is connectedto a gauge wheelor other unit arranged to follow the ground independently of the tractorand operatively connected therewith so that the power lift connectionsmaintain the plow beam and gauge wheel in the desired adjusted relation,the gauge wheel and the tool beam relative to the tractor. Hence,

while the power lift mechanism on the tractor is operatively connected.first, to position the gauge wheel relative to the tool means todetermine the depth of operation thereof and, second to raise both thetool means and the gauge wheel of! the downward movement relative to thethe gauging means thereof ground, yet the gauge wheel in normal workingposition remains in adjusted relation with respect to the tool means andcan follow inequalities of the ground traversed with the consequencethat the depth of plowing remains uniform. So far as I am aware, it isbroadly new to provide an implement of this kind which is gauged, nofrom the tractor, but from the ground surface, yet has its depth ofoperation controlled by mech-' anism on the tractor, which mechanism isalso arranged to raise the unit into its transport position.

One specific feature of the present invention resides in the provisionof a single member on the tractor operatively connected through a firstlinkage for adjusting thedepth of operation and then operative through arelated linkage to raise the tool into transport position, each linkageso constructed and arranged that each is permitted to perform itsprescribed function, without interference from the other. In otherwords, the power lift connections are so arranged that during the depthadjusting range the gauge wheel is moved downwardly relative to the toolbeam and in the lifting range of the tool beam is raised but the gaugewheel is prevented from further tool beam,to

any material extent.

Another important feature of the present invention is the provision ofmeans associated with a hydraulic lift mechanism for automaticallyreturning the implement to a given operating depth, which can beadjusted, after the implement and has been raised into lifted ortransport position. Briefly, according to the present invention, suchmeans includes an operating membe for the hydraulic power lift valve,with a. part mounted for adjustment thereon and operatively connectedwith the lowerin mechanism whereby when the plow or other tool has beenlowered to a given point relative to the gauge wheel, the hydraulicpower lift controlling valve is automatically returned to a positionlocking the hydraulic mechanism against further movement.

. These andother objects and advantages of the present invention willFigure 1 is a perspective view of the rear end of a tractor having ahydraulic lift of the double acting locking type and serving as thepropelling the following the latter and the unit for a plow of theintegral type having an adjustable gauge wheel which is operativelyconnected with the tractor power lift mechanism so that the latter maybe utilized for gauging the depth of operation of the tool and alsoraising gauge wheel into transport position;

Figure 2 is a side view of the machine shown in Figure 1, the plow beingillustrated in a deep plowing position;

Figure 3 is a view similar to Figure 2, showing the plow in shallowplowing position, Figures 2 and 3 showing the amount of movement of thepower lift mechanism utilized for the depth controlling operation;

Figure 4 is a view similar to Figures 2 and 3, showing the parts intheir relative positions they occupy when the plow is'raised into itstransport position;

Figure 5 is a fragmentary side tiew, showing the position of the depthcontrolling levers for shallow plowing but with the unit in its raisedor transport position Figure 6 illustrates the application of theprincipla of thepresent' invention to a single bottom lister mounted ona tractor having a power lift of thehydraulic double acting locking typearranged to control the depth of operation and to raise the listerbottom and the gauging means simultaneously into transport position;

Figure 7 is a view similar to Figures, showing the parts in thepositions they occupy when the lister is in a shallow plowing position;

Figure 8 shows the occupy when the unit is raised into transportposition:

Figure 9 is a side view of a cultivating implement in which theprinciples of the present invention have been incorporated;

, Figure 10 is a view of the implement shown in Figure 9, with the toolsdisposed in their shallow orking position and with the power lift unitin a position to start raising both the tool means and the gauge wheelrelative to the tractor;

Figure 11 shows the tool means and gauge wheel in their raised ortransport position; and

Figure 12 is a fragmentary section taken on the line |2|2 of Figure 9.

ically actuating the valve into either of its fully raised or fullylowered positions has been omitted and the valve means arranged so thatit may be moved into an intermediate position, locking the piston in anyposition in its cylinder against movement in a downward direction, alongthe lines of the hydraulic power lift shown in the patent to HaroldBrown, No. 1,929,804, issued October 10, 1933. Obviously, of course, anyother suitable form of power lift mechanism,'either doubleorsingle-acting, may be employed in the present invention, so long as suchmechanism is of the type which may be raised or'lowered, as desired, orheld in any intermediate position, in any suitable manner as by moving avalve lever, such as l2, from a neutral or locked position into eitherof two operative positions.

The integral implement chosen to illustrate the principles of thepresent invention embodies a plow including by hitch means 22 to theforward portion of the tractor and carrying at its rear end a plowbottom 23. According to the principles of the present invention thedepth of operation of, the

parts in the positions they 7 Referring now to the drawings, moreparticularly to Figures 1-5, inclusive, the tractor which serves as animplement or supporting frame is indicated in its entirety by thereference numeral I and includes a frame 2, a motor 3 and a rear axlestructure I, the latter includingaxle shafts 5 and 5 upon which the reartraction wheels I of the tractor are mounted. In Figure 1, the near rearwheel is removed so as to show the power lift connections. The powerlift of the tractor is indicated generally by the reference numeral l0and is of the hydraulic type which includes a rock shaft actuated bysuitable hydraulic mechanism under the control of suitable valve meanshaving a valve actuating arm I 2. Preferably, the hydraulic mechanismincludes a pump drivenfrom the tractor motor, a double acting cylinderand piston arrangement for rocking the shaft II from one position to theother underthe control of the valve means at l2. The power liftmechanism indicated at I0 may take the general form of the power liftmechanism disclosed in ,my prior Patent 2,197,848, dated April 23, 1940,and this is the general form of hydraulic lift mechanism shown by way ofillustration in the drawings, with the exception that the feature ofautomatplow bottom 23 is controlled by a gauge wheel 25 journaled forrotation on the rear end of a swinging link 26, the laterally directedforward end 21 of which is mounted for general vertical rocking movementand generally lateral shifting movement in a pair of vertical standards28 and 29 which are connected in any suitable manner to a pair ofbrackets 3| and 32 secured, as at 33, to the rear axle of the tractor,preferably to the under side of the enlarged central portion of the rearaxle housing 4. By virtue of this construction the gauge wheel 25 isattached to the tractor yet can follow variations of the ground surfaceindependent of the tractor. Also, when the plow beam swings laterally, asmall amount of which is permitted by the draft connections 22, thegauge. wheel 25 follows the plow beam since the end 21 canshift'laterally in the standards 23 and 29.

The position of the gauge wheel 25 relative to the p is controlled byconnections therebetween which include a pair of toggle links or arms 35and 35. The link or arm 351s pivoted to the beam 2| by a bolt the lowerlink or arm 35 is pivoted to the swinging link or crank axle 25 by meansof a bolt or other means '39, preferably arranged on the axis ofrotation of the gauge wheel 25. The two arms or links 35 and nected bymeans of a pin or other mean 4|, as best indicated in Figures 2 and 3.When the toggle arms or links 35 and 36 are-moved into collapsedposition (Figure 2) the gauge wheel 25 is nearest the plow beam 2|, andhence the plow bottom 23is arranged for deep plowing. When the togglearms or links 35 and 36 are extended (Figure 3) the gauge wheel 25 isfarthest from the plow beam 2| and hence the plow bottom 23 is arrangedfor shallow plowing.

the. power lift mechanism I0, and is provided with three arm sections5|, power lift arm 5| is connected by means of a link 54 to a bell crank55 which consists of an arm a plow beam 2| connected or other means 31,and,

36 are pivotally intercon- 58 rigidly connected to a second arm 51, bothbeing carried .on a transverse shaft 52 which is supported at itsopposite ends in the upper ends of the vertical standards 28 and 29. Theconnecting link is pivotally connected at its ends, asat 5| and 52, tothe power lift arm II and the upperendofthebellcrankarm".ThelowerendofthebellcrankarmlLshownatllainFlgure 1, plvotally receivesthe forward end of a link II, the rear end of which is connected by thepivotpin 4| tothetogglelinksor arms 35 and. It will be observed that thelower end 510 of the bell crank arm 51 is disposed closely adjacent theaxis of theswinging crank axle section 21 for a purpose that will beexplained below. As will be clear from Figure 1,- when the power liftmechanism Ills actuatedtoswingthearm 5| inone direction or the other, athrust or a pull is trans-- mitted through the link- 54 and the bellcrank 55 to the link 52, which swings the arm in one direction or theother and causes the lower link to raise or lower the rear end of theswinging link 28 and the attached gauge to the plow beam 2|.

The second arm 52 of the power lift bell crank 52 is provided or formedwith a pair of yoke sections and which are spaced apart and receive atrunnion 61 therebetween; The member 61 is apertured and slidabl-ydisposed about the upper end of a link 55. The upper end of the iatteris threaded and receives a pair of lock nuts II. The lower end of thelink is .is formed or wheel 25 relative provided with a yoke" which isconnected by a pivot 12 to the plow beam 2|. In the normal operatingposition, as shown in Figures 1 and 2, the. trunnion member 61 isdisposed a substantial distance below the-lock nuts ll, whichconstruction provides means in the form of a lost motion connectionbetween 'the plow beam 2| and the power lift mechanism, whichconstruction permits the plow beam 2| and the gauge wheel 25 connectedtherewith to rise and fall relative to the tractorabout the hitchconnection 22 at the forward end of the plow beam'2l. Thus, the gaugewheel 25 determines the operative position of the plow bottom 22independently of the position of the tractor. During this rising andfalling movement of the plow beam 2| and the gauge wheel 25, theconnecting link or crank axle 25 of the latter pivots about the section21 which is supported for rocking movement on the tractor at the lowerends of the standards 28 and 29. Since the forward end of the link Bl,the longitudinal position of which determines the angularity of thetoggle arms 35 and 25. and hence the position of the gauge wheel 25relative to the plow beam 2|, is disposed closely adjacent the axis ofthe crank axle section 21, it will be seen that rising and fallingmovement of the gauge wheel will occasion very little change in positionof the toggle arms 25 and 3|, and hence the operating depth of the plowbottom 22 is maintained substantially constant even though the -operatorwho usually rides on the seat '83, and

the hand lever 8| is connected by a link 85 to one arm of a small bellcrank 85, the other arm of which is connected by a link 81 to the valvelever lift shaft II in the position it occupied at the moment the valvel2 was returned to its intermediate or locked position from a positionproviding for rocking the shaft II in one direction or the other.Preferably, the movement of the hand lever 8| forwardly, or in aclockwise direction as viewed in Figure 2, provides for a raising orclockwise movement of the rock shaft II, and similarly a rearward oranti-clockwise movement of the hand lever 8| operates the power liftvalve means in such a way as to cause the power lift rock shaft II to berocked in an anti-clockwise direction. 'As explained above, at any pointthe hand lever II can be returned to its intermediate or neutralposition, locking the power lift shaft II in that position againstfurther movement in either direction. v The operation of the mechanismso far described is substantially as follows:

Referring to Figure 2 where the plow bottom 22 is shown in its deepplowing position, and the valve controlling lever 8| in its intermediateor,

implement is free to pivot vertically about the hitch 22 relative to thetractor to follow inequalities in the ground surface and the position ofthe pivot at the-forward end of the link it closely adjacent the axis ofthe gauge wheel link section 21 prevents such movement of the implementrelative to the tractor from aflecting the position 'of the gauge wheel25 relative to the tool beam 2|. When it is desired to raise the plow;bottom 22 into a shallow plowing position, the valve lever 8| is movedforwardly, or in a clockwise direction as viewed in Figure 2. This opensthe valve means I2 and causes the hydraulic power lift mechanism to rockthe shaft II in a clockwise direction (Figures 2 and 3), and thecorresponding movement of the power lift arm 5| exerts a thrustgenerally rearwardly through the link 54 to rock the bell crank 55 in acounter-clockwise direction (Figure 3), and thisexerts-aforward pullthrough the link fill which moves the toggle links or arms 35 towardtheir extended or straightened position and thrusting forwardly on thegauge wheel 25 to raise the plow beam 2| relative thereto, as showninFigure 3. relative to the plow beam 2| to the desired extent, theoperator returns the valve lever 8| to its neutral position, therebylocking the power lift shaft ,ll against further movement and thusholding thegauge wheel in its adjusted position relative to the plowbeam 2|.

As shown in Figure 3, when the plow bottom 23 is raised to itsshallowest position, the trunnion member 51 is raised by thecorresponding movement of the power lift arm 52 up to but not inengagement with the nuts III at the upper end of the lifting link 89,there being clearance as shown at S to-permit the implement to movevertically relative to the tractor in following the when the gauge wheelis moved ground surface. Upon further actuation of the power lift shaftII in a clockwise direction, as by moving the valve lever 9| into orholding it in its raising position, the rear end of the power lift arm52 will now move up into engagement beam 2| will be lifted into itsraised or transport position, as shown in Figure 4. While the initialmovement of the power lift arm 52, as from p the position shown inFigure 2 to the position shown in Figure 3, servesto lower the gaugewheel 25 relative to the plow beam 2|, so as to move the plow bottom 23into a shallow plowing position, it will be seen that the continuedupward movement of the power lift arm 52 to raise the implement into itstransport position does not continue to move the gauge wheel 25downwardly relative to the tool beam 2| as occurred during the initialmovement of the arm 52. This result is secured in the following manner:In the, deep plowing position (Figure 2) the arm is disposed at an angleof something more than 90 degrees relative to the link 5|, and thelatter in turn is disposed at an angle somewhat less than 90 degreesrelative to the bell crank arm 56. However, after the first range ofmovement of the power lift rock shaft carries the trunnion member 81 upagainst the nuts HI and swings the arm 5| into a position movingthegauge wheel 25 to its shallow plowing position, the arm 5| approaches astraight line position relative to the link 54, and as will be readilyunderstood, this is a position in which further angular movement of thearm 5| relative to the link 54 oocasions only a small amount of movementof the bell crank 55, since the link 54 will not be shiftedlongitudinally except through a small amount. Further, in this positionof the parts the toggle arms or links 35 and 26 also approach theirstraight line position, so that whatever small amount of movement of thebell crank 55 is occasioned by the movement of the power lift rock shaftH from the position shown in Figure 3 to the position shown in Figure 4has only an insigniflcant or negligible effect upon the position of thegauge wheel 25 relative to the plow beam 2|. By comparing Figures 3 and4, it will be seen that the gauge wheel 25 moves only slightly relativeto the plow beam 2| while the latter has been lifted from its shallowplowing position (Figure 3) into its completely raised position (Figur4).

It will be understood, of course, that the angular relations describedabove are merely examlink 26 and the tractor (Figure 2) to a positionslightly forward thereof (Figure 3) during the movement Of the parts inthe depth adjusting range, and further, that the point of pivotalconnection between the forward end of the link 60 and the lower end 51a.of the bell crank arm 51 swings substantially through the pivot axis ofthe link 28. By virtue of this construction, the pivot points of thelinks 28 and 80 are so near together that swinging movement or the plowbeam 2| about its hitch 22 at the forward end of the tractor inaccommodating inequalities in the ground traversed will havesubstantiall no eifect upon the relation between the gauge wheel and theplow beam 2|, which relation is determined by parts carried, not on theplow beam itself but upon the tractor. This is an important feature 01'the present invention, namely, gauging the depth of operation'by meanson the tractor but I permitting the gauging means and the earth workingtool to have relatively free movement relative to the tractor. As willbe readily understood, by moving the lever 9| rearwardly, the power liftrock shaft may be rocked from the position shown in Figure 4 to firstlower the plow into operating position and then to cause the plary andthat various changes may be made therein as required by the operatingoharacteristics of the implement in which the adJusting and liftingconnections are incorporated. The important feature is, as will beapparent, the arrangement of the parts whereby through the action of asingle member, such as the power lift rock shaft II, the first range ofmovement thereof effects an adjustment of the Banging means. therebymoving a gauge wheel or the like relative to the tool beam 2|, and thata subsequent range of movement ,of said member serves to lift both thetool means andthe gauging means out of ground engaging position and intoa transport 'position'(Figure 4) Further, it will be seen that in itsrange of movement, the lower arm 51 of the bell crank 55 swings from aposition slightly tothe rear of the pivot connection between the tionsin that position.

Ordinarily, the farmer desires to maintain a substantially constantdepth of plowing througharm 5| to exert a pull on the link 54 and henceswing the bell crank 55 in a clockwise direction (Figures 3 and 4) thuspermitting the plow bottom 23 to lower relative to the gauge wheel 25 tothe desired operating depth. When the plow bottom 23 reaches the desired'depth the valve lever. 8| may be returned to neutral position, whichlooks the power lift and gauging connecout the whole field, even thoughit is necessary to raise the plow to transport position (Figure 4) whenturning around at the ends of the field. If necessary, the farmer canalways return the plow bottom 23 to lowered position at exactly thedepth desired by watching the plow and at the proper moment returningthe valve lever II to its neutral position. However, according to theprinciples of the present invention, 1- provide ,meansassociated withthe power lift mechanism and the controlling valve lever 9| therefor, soconstructed and arranged that the mechanism may be so adjusted as toreturn automatically to the same depth without requiring an attention onthe part of the operator other than first making the desired depthsetting and then initiating the lowering of the implement, the mechanismthen subsequently returning the valve means automatically to its lockedposition when the plow bottom 29 and/or gauge wheel- 25 occupy thedesired relative position to secure the proper depth of operation asdetermined by the depth'setting.

Referring again to Figure 1, the valve adjusting lever 9| carries anextension 9| having serrations or ridges 92 over which the upper end ofa lever 99 may be moved. The lever 92 is pivoted at 94 on the lever'lland carries a pin 96 on which the slotted end, as at 91, of the link 98is received. The other endof the link 92, as shown at 99, is pivotallyconnected to the third arm of the power lift bell crank 50. The lever 93serves as a depth setting member and carries a hand grip or handle II.

The function of the link 92 and associated parts is to act through thelever 93 to automatiposition,

, (dotted lines. Figure that the pin 99 occupies a position adjacent theupper and outer end 'of the slot 91. Also, in Figure 5, the lever 93occupies a position close to the lever 9|, which corresponds to theadjustment of the parts for shallow plowing, as shown in Figure 3.Assuming that the farmer desires to return the implement from itsraised. position (Figures 4 and 5) to its lowered position (Fig-' ure'3) he manually moves the valve lever 9| from its full line position inFigure 5 to its dotted line the depth setting lever 93 moving bodilywith the lever 9| as permitted by the slot 91 accommodating the downwardand rearward movement of the pin 99 therein. The rear movement of thelever 9I actuates the power lift valve means sdas to cause the rockshaft II to be rocked in a counter-clockwise direction (Figures 4 and5), and the downward swinging movement of the arm 52 inconsequencethereof lowers the plow,

and at the same time the downward and for-- ward swinging movementof'the power lift arm 5I acts through the link 54 to position the gaugewheel 29 for shallow plowing (Figure 3). Further, and alsoat the sametime, the forward and upward swinging movement of the arm 53 shifts thelink 99 forwardly until the inner end of the slot 91 engages the pin 99.Further continued downward movement of the power lift shaft II and the'power lift bell crank 59 then exerts a thrust through the link 99against the pin 99" until the lever 9I is automatically moved 'back intoits neutral position (full lines, Figure 5),

' thereby locking the parts for plowing at the operating depth asdetermined by the position of the lever 93 on the lever 9|. If, insteadof .being adjacent the hand lever 9|, the depth setting lever 93 isdisposed in adjusted position, such as.

indicated in Figure 2 for deep plowing, it will be apparent that whenreturning the plow to operating position, the link 99 will be requiredto moveforwardly an additional amount before engaging the pin 99 andautomatically returning the lever 9I to its neutral position. Hence,when the lever 93 is in the position shown in Figure 2, the power liftmechanism continues to lower the arm past the position shown in Figure3, which action shifts the gauge wheel links and 39 to the positionshown in Figure 2 before the lever 9| is automatically returned to itslocked position. Therefore, according to the principles of the presentinvention, the operating position of the implement is automaticallycontrolled by the setting of the lever". Preferably, the slot 91 is ofsumcient length that 99 can move into its raised position (Figure 5)while the arm 9|, controlling the power lift valve mechanism, remains inits forward position setting of the lever 93on the sector 9|. This isfor the purpose of preventing the movement of the power lift mechanismto raised position affecting the valve operating lever 9|, since it is.

preferable to have the plow raised to the same position, regardless ofthe depth setting of the lever 93. As disclosed in my prior patent,identifled above, the power lift mechanism will automatically stop inits fully raised position, independently of the position of the valvecontrolling lever 9I. However, if it is desired to automatically controlthe implement by moving the valve the power lift bell crank 3),regardless of the depthlever 9I automatically to a position when thebell crank 59 reaches its completely raised position (Figure 5), asecond link, similar to the link 99, may be pivoted at 99 or some otherpart and slotted to receive a pin, similar to the pin 99 on the lever93, mounted on the lever 9 I WhereLY, regardless of the'setting of thelever 93, the lever 9| will automatically be moved into neutral positionwhen the bell crank member 99 on the powhave shown the present inventionas applied to a single bottom tractor mounted lister. A lister sleevemember I93 of this general type is disclosed and claimed in theco-pending application of Walter H. Silver, Serial No. 296,925, filedSept. 28, 1939. InFigures 6-8, the lister frame is indicated by thereference numeral I29 and consists of a pair of frame bars I2I and I22extending generally longitudinally of the tractor I to which it attachedby means of a pair of vertically depending bars I24 pivoted at theirupper ends to the tractor frame bars 3 and secured at their lower endsto a transverse draft member in the form of an angle bar I25. Draft rodsI29 extend forwardly from the cross bar I25 to the front portion of thetractor, and the frame bars I2I and .I22 are pivoted by means of pivotbolts I21 to brackets I29 which are .bolted, as at I29, to opposite endsof the cross bar I25. The pivot bolts I21 define a transverse pivotaxisabout which the tool bar or beam structure I29 may swing generallyvertically relative to the tractor I.

The reanends of the frame bars III and I22 converge rearwardly, asindicated at I2Ia and are bolted at I3I to the upper end of a listerbottom standard I32. A lister bottom I33 is secured to the lower end ofthe standard I32.

The gauging meansfor the implement shown in Figures 6-8 comprises a pairof crank axles I39 and I39 pivotally connected to the associated framebars I2I and I22, respectively, and carrying gauge wheels I4I at theirrear ends. Each of the crank axles I39 and I39 includes a laterallyoutwardly bent end I43 rocking movement in a bracket I44 secured, as bybolts or the like, to the associated frame bar, and similarly, each ofthe crank axles also includes a laterally inwardly bent end I49 on whichand I22 adjacent the rear ends of the converging portions thereof. Thepivot connection between the two arms or links I49 and I5I is indicatedin Figures I and 9 by the reference numeral I51. A second arm I9I isfixed to the rock shaft I52 and at its outer end is pivoted to trunnionson a that is slidable on the upper end of a strut I94. is pivotallyconnected, as at I95, to a pair of angle brackets I99 which are bolted,as at I91, to the.

under side of the tractor rear axle housing. A stop "I is fixed to orformed on the strut I94 in a position to be engaged by the slidablememwhich is-received for The lower end of the latter ber I83 to enablethe tool beam to be raised, as will be explained below. The arms NH andI8I constitute in effect, a bell crank of which the arms are sectionsconnected, respectively, with the gauge wheel I and the strut I84.

In this form of the invention, the power lift mechanism III is, as inthe form described above, so connected with the gauge wheel structurethat vertical swinging movement of the tool beam relait possible for thelatter to swingvertically, carrying with it the gauge wheel 28, butwithout having the movement of the plow beam and/or gauge wheel relativeto the tractor, and the gauging and lifting connections carried thereby,introduceany variations in the position of the gauge wheel relative tothe plow beam 2I. In the form of the invention shown in Figures 6-8, theconnections for gauging and lifting include a flexible element trainedabout a sheave that rotates-about an axis coincident with the axis ofthe pivot bolts I2'l. Hence, the frame structure I is enabled to swingvertically, carrying with it the gauge wheels I, but the gau ing andlifting connec-' tions extending between the gauge wheel structure andthe tractor do not cause the positions of the gauge wheels I relative tothe frame structure to vary.

In this form of the-present invention an arm I88 is fixed to one endofthe power lift rock shaft I I' and is connected by means of a flexiblecable Ill, which is trained over a pulley I82 on the rear axle, a sheaveI83 carried by the cross bar I28 and an idler sheave I84 on the framebar I22, to an arm I 88 fixed to one end of the rock shaft I82 carriedon the lister beam for rocking movement in the brackets I83. As bestshown in Figure 8, the sheave I83, the axis of rotation ofwhichcoincides with the pivot axis for the lister beam structure as definedby the pivot bolts I21, is carried by a bracket I ll bolted orotherwisefixed to the cross bar I28. Preferably, the sheave I83 is mounted forrotation on the bracket I8I by a pivot bolt I82. The idler sheave I84 issupported for rotation by a bracket I83 fixed in any suitable manner tothe beam structure I 20. Since the sheave I88 is mounted'for rotationabout the pivot axis of the lister beam or frame structure I28, it willbe seen that rising and falling movements of the lister will notintroduce any variations in the position of the gauge wheels relative tothe lister frame. V

.The operation of the construction shown in Figures 6-8 is substantiallythe same as that describedabove in connection with Figures 1-5. InFigures 6-8, when the valve lever 8 I is moved forwardly the rock shaftII is rocked in a direction to raise the implement, namely, in aclockwise direction as viewed in Figure 8. This exerts a pull throughthe cable I8I and acts to rock the arm I88, also in a clockwisedirection.. .This acts through the toggle arm or link I5I and exerts adownward thrust on the links I48 and thefassociated gauge wheels I,thereby raising the lister bottom I33 substantially to the positionshown in Figure 7, which is the shallowest working posi- I sameprotection for the tion. The relation of the links is: and m is 6 suchthat at this point the shiftable sleeve member I83 is spaced as at S,from the stop flange III. If the valve lever or raised position, thepower lift shaft II continues to rock in a clockwise direction and thepull exerted thereby, through the cable I8I against the arm I88 causesthe outer end of the arm II to move the member I83 into engagement withthe stop "I and react through the strut I84 and brackets I86 against thetractor to raise the lister beam structure I28 from the position shownin Figure 7 to the position shown in Figure 8. However, it will be notedfrom Figure! that the toggle arms or links I48 and lil are nearly intheir straight line position, and hence the angular movement of themember I53, I88 necessary to raise the tool beam to the transportposition shown in Figure 8 does not cause the gauge wheels I4I to movevery much farther relative to the tool beam. In fact, the toggle linksI48 and I5I serve to hold the gauge wheels I in a position slightlybelow the lister bottom I33 when the gauge wheels and the lister bottomare raised into theirtransport position, as shown in Figure 8. Thewheels I thus are in a position to prevent the plow bottom point fromdigging into the ground if the tractor wheels should pass down into adepression. In this case the wheels I would engage the ground andmomentarily lift the whole implement, as permitted by the slidablemember I63. If desired the links 35, 38 and 88, 51 of Figures 1-5 may bearranged to provide this plow bottom 23 when raised. 4

When the tool beam reaches the position shown in Figure 8, the valvelever BI is returned to its intermediate or locked position. Thus,according to the present invention I provide suitable connectionsbetween the power lift arm I88 and moving any material extent relativeto the tool beam being raised. The lister is lowered from its transportposition into an operating position by moving the valve lever 8| themodification shown in Figures 1-5 and described above, and when thelister reaches the desired operating depth, the valve lever 8|, isreturned to its intermediate or locked position which holds the gaugewheels and associated parts in their adjusted operating position. Ifdesired, the automatically operating means for returning the valve lever8| to intermediate po;- sition when the plow reaches a predetermineddepth, such as is shown in Figures 1-5 and described above, may beemployed in the construction illustrated in Figures 6-8. However, forpurposes of clarity, such automatic means for returning the lister to' apredetermined operating position has been omitted from Figures -6-8.

Both of the agricultural implements described above have been in thenature of integral plows carried by the tractor at the rear thereof.However, the principles of the present invention are equally applicableto implements carried at the front of the tractor, such as, for example,culti- 8I is held in its forward rearwardly, as in both 'for; changingvators having gauging the operating depth of the cultivating tool ortools and adapted to be raised into in-' operative or transportposition.

Referring now more. particularly 9-12, inclusive, the tractor l is shownas provided with one or more cultivator units, indicated by thereference numeral 200, supported by one or more-transverse draft beams20L The latter extends outwardly from the forward portion of the tractorat each side thereof according to the usual arrangement of tools of thischaracter. Rigidly secured to the draft beam 20l is one or moresupporting members 203, depending upon the number of rigs 200 employed.Each supporting member 203 includes an upper section 204 in which a rockshaft 205 is carried and the lower section 206 in which the pivot 201 ofa connecting link member 200 is received. An upper link 2l2 is disposedin substantial parallelism with the lower link 200 and is provided atits upper end with a screw threaded portion received in a socket 2Bwhich is pivotally mounted on the rock shaft 205. The lower end of thelink 212 is turned outwardly, as at MS, and is pivotally disposed in theupper end of a bracket 2|! forming a part of a shovel supporting member2l0, the lower end of which is provided with aperture legs 2|! in whichthe lower end of the lower link 200 is disposed and connected thereto bya pivot pin 220 or other suitable means. A shovel unit 22! is adiustablysecured to the member 2I8 by means of a bracket 222.

Also pivotally mounted on the end MB of upper link 212 is an L- hapedbracket 221 carrying a sleeve 220 at its forward end in which thespindle 229' of a castering gauge wheel 230 is disposed, and theposition of the gauge wheel 220 relative to the tool MI is controlled,by means of a link 234 which is pivoted at its lower end 235 to thearmor end, as-best shown in Figure l2,is bent later.- ally, as at 235,and pivotally received in a depth adjusting arm 240. The latter is fixedby a set screw or the like, as indicated at 2 in Figure 12, to the pivotshaft or rock shaft 205.

A cultivator rig of this general construction is disclosed and claimedin the Patent No. 1,962,- 349, issued'June 12, 1934, to Theodore W.Johnson, to which reference may be had if desired. As disclosed in saidpatent, the links 200, M2 and 234 are arranged in parallelism so thatthe tool 22l and its gauge ,wheel 230 may rise and fall relative to thetractor so as to follow free,- 1y any variations in the ground surface.Further, rocking of the arm or arms through the associated link 234 tochange the position of the guage wheel 230 relative to the tool 22l. Asmore clearly shown in said patent, thepivotor rock shaft 205 carries asmany arms 240 as there are cultivator rigs 200 at that side of thetractor.

According to the principles of the present invention, I provide meanswhereby the power lift mechanism l of the tractor may be utilized,

the depth adjustment of the gauge wheel or wheels 230 and for raisingthe cultivator rig or rigsinto transport position out of engagement withthe ground. To this end, an arm 250 is suitably fixed at its'lower endto the rock shaft 205 and at its upper end carries a member 25! fixed,as'by collars 252 and 25211,

to the forward end of a power rear end of the latter is pivoted, as at254, to an operating arm 255 fixed to the rock shaft ll of gaugewheelsor other means for.

to Figures the bracket 221 and at its upper mechanism l0. Where thereare cultivator rigs at opposite sides of the tractor I, each end of therock shaft ll may carry an arm 255 connected to the rod 253 to theassociated rock shaft arm 250. According to the present invention, eachof the adjusting arms 240 is formed with a lug 260 which, as best shownin Figure 12, extends laterally underneath the associated sleeve 2l3 towhich the forward end of the link M2 is connected.

The operation of the implement shown in Figures 9-12 is similar to theimplements described above. The power lift mechanism I0 is controlled bythe hand lever 0l in the manner described above. When the hand lever 0|out of its neutral position into a forward position, the power lift armwise direction (Figure 9), which exerts a thrust through the rod 253 onthe arm 250. This'rocks the pivot shaft 205 in a clockwise direction,which exerts a rearward thrust through the link 234 against the gaugewheel bracket 221, raising the tool 22l relative thereto. Figure 9 showsthe latter in a relatively deep ure 10 shows the relative when the powerlift mechanism l0 has been actuated to act through the arms 250 and 240to raise the tools to shallowest position, at which point the lug orlugs 260 are in a position ready to engage the sleeves 2|3 of the links2l2. After this occurs, a further'forward movement of the the power liftrod 253 acts through the arm 250 and pivot shaft the position shown inFigure 9 240 willact lift link :53. 'The 205 to raise the cultivator rigor rigs intotheir lifted position, as shown in Figure 11. It will beseen, therefore, that the arm or arms 240 have two ranges of movement;first, in moving from to the position shown in Figure 10, the arm orarms 240 determine the position of the gauge wheel or wheels 230relative to the tools, and second, when the arm or arms. 240 move fromthe position shown in Figure 10 to the position shown in Figure 11, boththe tools and the gauge wheel or wheels are raised together out ofground engaging position. Preferably, the gauge wheels 230 are disposedto one side of the path of movement of the associated tool 22!, so thatwhen the rig is raised, each gauge wheel may be disposed in a positionalongside the associated tool. Like the form of the invention shown inFigures 6-8, the automatic valve controlling means shown in Figures 1-5may, if desired, be employed in the construction just described foradjusting the depth of operation and automatically returning the tool ortools to the selected working position. It will also be'apparent thatthe means I have provided for gauging the depth of operation of tools,freely movable relative to the tractor, from the power lift mechanism ofthe tractor may be utilized with tools both at the tractor, as bycombining the mechanisms shown in either of the first described twomodifications erally speaking, the power lift shaft, or the arm' or armsconnected therewith, forms a part which is operatively connected withthe gauging means for first adjusting the same relative to theassociated toolmeans and then raising both the tool to the means and thegauging means relative is moved 255 is rocked in a clock-- plowingposition, and Figpositions of the parts front and rear of the tractor.

new.

While I have shown and described above the preferred means in which theprinciples of the So far as I am aware, this is broadly presentinvention have been incorporated, it

will be apparent to those skilled in the art that my invention is not'tobe limited to the particular means shown and described above, but that,in fact, widely different means may be employed in the practice ofvention.

What I claim, therefore, and desire to secure by Letters Patent is:

1. An agricultural machine comprising a tracthe broader aspects of myinl0 then raising both said gauge and tool and means for shifting theother of said links for varying the position of the gauge means relativeto said tool means.

7. The combination with a tractor, of tool means movably connectedtherewith, gauge means normally movable with said tool means but capableof being shifted relative to said tool means for gauging the operationthereof, means on the tractor for first shifting the position of saidgauge means relative to said tool means and means together, and meansassociated therewith for limiting the lowered position of said toolmeans.

tor having a power connection, tool means connected with the tractor,means for gauging the, depth of operation thereof, means for liftingsaid tool means, and means deriving power from the tractor powerconnection for actuating said gauging means and said lifting means insuccession.

2. An agricultural machine comprising a tractor having a powerconnection, tool means connected with the tractor for movement relativethereto, gauging means normally movable with said tool means relative tothe tractor, means for a lifting both the gauging means and the toolmeans, and means deriving power from the tractor power connection foractuating said gauging means and said lifting means in succession.

3. An agricultural machine comprising means serving as an implementframe, tool means movably connected therewith, gauging means connectedwith said frame means for movement relative thereto about an axis,adjustable connections between said tool means and said gauging meansand operative to cause the latter to move with said tool means relativeto said frame means when the tool means is moved, a member for operatingsaid adjustable connections and extend-' 40 ing to a point adjacent saidaxis, and means on the frame means pivotally connected with said memberat a point closely adjacent said axis for adjusting said connections anddetermining the position of said tool means relative to said gaugingmeans while accommodating movement of the latter with the tool means.

4. The combination witha tractor, of tool, means movaoly connectedtherewith, gauge means normally movable with said tool means for gaugingthe operation thereof, means for shifting the position of said gaugemeans relative to said tool means, and a member on the tractor connectedwith both said tool means and said tuate said gauge means means.

5. An agricultural implement comprising an implement frame, a plow beammovabiy conand then raise said tool nected therewith, a gauging meansmovabiy connected with said plow beam, a link connecting gauge means andoperative sequentially to ac-' 8. The combination with a tractor, ofground engaging tool means connected to receive draft therefrom and tomove generally vertically relative thereto, a gauge wheel, connectingmeans -between said gauge wheel and said tool means and movable to gaugethe depth of operation of the latter, power lift mechanism foractuatingsaid connecting means, and a lost motion connection actuated bysaid power lift mechanism and first accommodating movement of saidmovable member when shifting said gauge wheel relative to said toolmeans and then acting to raise bothsaid tool means and said gauge wheelrelative to the tractor after the lost-motion has been taken up. I

9. The combination with a tractor, of ground engaging tool meansconnected therewith to receivedraft therefrom and to move generallyvertically relative thereto, a gauge wheel normally movable with saidtool means but capable of being shifted relative to said tool means forgauging the depth of operation thereof, a member having a lost motionconnection with said tool means, anda part movable to position said:gauge wheel relative to said tool means to adjust the depth ofpenetration' of the latter and simultaneously move said member to take'up said lost motion, further movement of said part acting through saidmember to raise said tool means and said gauge wheel.

g 10. The combination with a. tractor having a power lift, of groundengaging tool means connected therewith to receive draft therefrom andto move generally vertically relative thereto, a gauge wheel, movableconnections between said gauge wheel and said tool means and movable togauge the depth of operation of the latter, a

member driven by the tractor power lift and having a lost motionconnection with said tool means, and a part movable with said member andoperable to position said connections while the movement of said memberserves to take up said lost motion, further movement of said power liftacting through said member for raising both said gauge wheel and saidtool means.

' 11. An agricultural implement comprising tool means adapted to beraised and lowered, gauge means for said tool means, said-gauge meansbeing movable relative to said tool means to gauge the operationthereof, a power lift operated lever, means operated by the latterthrough one range of movement thereof for s ting said gauge meansrelative to said tool means for gauging the depth of operation of thelatter, and means operated by said lever through another range of meansserving as a supporting frame, tool means movably connected therewith,gauge-means including'a ground engaging element and means connecting thelatter with said tool means, a pair of links connected with said gaugemeans, means connecting one of said links with .said frame,

movement thereof for raising both said tool means and said gauge meansout of ground enaging position.

12. The combination with a tractor, 'of tool means movabiy connectedwith the tractor for movement relative thereto, gauge means movabiytractor for movement relative connected with said tool means for gaugingthe operation thereof, means on the tractor and reacting thereagainstfor shiftin the position of the gauge means relative to the tool meansto change the depth of operation thereof, and means connecting said toolmeans and the means on the tractor that shifts said gauze means fordepth of penetration thereof, operated movement of said member throughone range for adiustlng the position of said gauge means relative tosaid tool means, means operatl ve by movement of said member in onedirection through another rangefor raising both the tool determining thelowered position of said tool means I 13. The combination with atractor, of tool means movabiy connected with the tractor for movementrelative thereto, gauge connected with said means movably tool means forgauging the operation thereof, mechanism for moving said gauge meansrelative to said tool means, means,

swingably connecting the gauge means with the thereto about an axis andaccommodating movement of said gauge means with said movable toolmeans,and depth adjusting means on the tractor and connected with saidmechanism at a point closely adjacent said ax 14. An agriculturalmachine as defined in claim 12, further characterized, by said tractorhaving a power lift including a movable member to which said connectingmeans connects said tool means, and means on said movable member forautomatically determining the lowered position of the tool means.

15. The combination with a tractor having a power lift, of tool meansmovably connected with the tractor for movement relative-thereto, gaugemeans movably connected with said tool means for gauging the operationthereof, mechanism for moving said gauge means relative to said toolmeans, means swingably connecting the gauge means with the tractor formovement relative thereto about an axis and accommodating movement oisaid gauge means with said movable tool means, a pair of interconnectedparts mounted on the tractor, means connecting .one of said parts withsaid mechanism at a point adjacent said axis, lost-motion meansconnectin the other part withsaid tool means, and means on the tractorfor operating both of said parts.

.16. An agricultural machine comprising a tractor having a power lift ofthe type in which a member may be moved to" and held in variouspositions, tool means, gauge means movably connected with said toolmeans, means operated by movement of said member through one range foradjusting the position of said gauge means relative to said tool means,and means operated by movement of said member through another range forraising both the tool means and said gauge means. i

17. An agricultural implement. adapted to be attached to a tractorhaving a power lift of the type in which a member may be moved to andheld in various positions. comprising tool means adapted to be movablyconnected with the tractor, gauge means movably connected with said toolmeans, means adapted to be operated by movement of said member throughone range for adjusting the position of said gauge means relaoperated bymovement of said member through another range for raising both thetoolmeans and said gauge means.

18. An agricultural machine comprising a tractor having, a power lift ofthe type'in which a member may be moved to and held in variouspositions, tool means mcvably connected with the tractor, gauge meansmovably connected with "said tool means and operative to determine theadapted to traverse and said pair of move said gauge causes said first19. A machine as defined in claim lsrfurther characterized by theprovision of a lever for eon-.

trolling the operation of said power lift member. rixed to said lever,and con-. said member and. said part, is moved into a positionlookfurther movea part adlustably nections between whereby said levering said power lift member a ment' after it has been rection apredetermined amount. l

20. In an agricultural implement adapted to be connected to a tractorhaving a power lift, the combination of a generally longitudinallyextend-v ing vertically swingable toolv beam carrying tool means, agauge wheel the surface of the ground for gauging the depth of operationof said tool means, a pair of links operatively connecting said gaugewheel with said tool beam, one of said links being pivoted to the latterand pivotal motion thereof acting through the other link to position thegauge wheel relative to said tool means, means actuated by said powerlift, lost motion means connecting said power lift actuated means withsaid tool beam, and means ex-, tending between said power lift actuatedmeans links for shifting the latter to said power lift actuated meansfirst serving to take up the lost motion in said lost motion means,further movement of said power lift means acting through said lostmotion means for raising said tool beam relative to the tractor, saidlinks being disposed at such an angle relative to one another after thepower lift actuated means takes up said lost motion that the movement ofsaid shifting means when raising the tool means occasions only a smallamount of movement of the gauge wheel relative to the tool beam.

21. An agricultural implement comprising the combination with a tractorhaving a power lift including a part adapted to be moved to and heldagainst movement in various positions, ground engaging tool meansadapted to be raised and lowered relative to the tractor, accuse wheelpivotally connected'with the tractor for vertical swinging movement,means serving as a toggle linkage operatively connecting and tool meanswhereby movement of said toggle linkage operates to shift the positionof said gauge wheel relative to said tool'means, a bell crank pivoted tothe tractor and having one arm with-said toggle linkage, meanslinkage'being arranged so that it moves into a generally straight linepositionat the same time the corresponding, movement of said bell cranktoggle linkage to move into its generally straight line position, andoperative connections between said power lift part and said moved insaid other di-.

wheel relative to said tool beam,

.further movement nected therewith, a

' a member pivoted thereto, a

a be rocked in one direction or the other and arranged to be shiftedinto a neutral position causing said rock shaft to be locked againstmovement in either direction, the combination of tool means adapted tobe connected with the tractor for generally vertical movement relativethereto,

means actuated by said rock shaft and operatively connected with saidtool means for raising and lowering the latter, and means movableconcomitantly with said tool means and operatively connected with saidlever for automatically moving the latter into a neutral position whensaid tool means reaches its lowered position.

23. The combination set'forth in claim 22, further characterized by apart adiustably connected with said lever and operatively associatedwith said concomitantly movable means for adjusting the position of saidtoolmeans when said valve controlling lever is moved into its neutralPosition.

24. The combination set forth in claim 22, further characterized by theprovision of connectionsbetween said rock shaft and said lever includinga link having a slot therein and-operatively connected with said rockshaft, and a part on said lever having a projection received by the slotin said lever, whereby the latter is connected with said rock shaftthrough a lost motion connection, movement of said lever in a directiontov carry said projection from one,

end of the slot toward the other serving to cause said rock shaft to berocked in a direction to raise said tool means and movement of the leverin the other direction serving to cause said rock shaft to be rocked ina direction to lower said tool means, said one end of said slot beingengageable with said projection to move said lever back into-a neutralposition, thereby terminating of said power lift rock shaft when saidtool means hasreached the desired lowered position.

27. In anagrlcultural implement, means serving as an implement frame,tool means movably 1 connected therewith, gauge means also movably 25.An agricultural machine comprising an implement frame, a cultivator rigmovably connected with said rig, andpower lift means operativelyconnected with said rig and gauging means and adapted through a firstrange of movement toshift said gau ing means relative to said cultivatorrig to determine the depth of operation thereof and through anotherrange of gauging means movably con-- movement for raising both saidcultivator rig and said gauging means out of ground engaging position.

26. In an agricultural implement, a tool bar, gauge wheel carried bysaid member and operative to determine the working position of said tool.bar, and means of movement for to said tool bar operative through onerange swinging said member relative to vary the working position of thelatter and having a part engageable with said bar for swinging'thelatter and said gauge wheel into transport position.

a part engageable with the connected with said frame means and operativeto swing relative thereto about a pivot axis, and means for adjustingthe position of said gauge means relative to said tool means, includinga part carried by said frame means and movable adjacent said pivot axis,whereby the position of the gauge means relative to the tool means is Isubstantially unaffected by variations in the position of the tool meansrelative to the implement-frame.

28. The combination set forth in claim 27, further characterized bymeans "operative after said part has moved through an adjusting rangefor-raising both saidtool means and said gauge means relative to theimplement frame means.

29. In an agricultural implement, means serving as an implement frame,tool means, means pivotally connecting said tool means with said framemeans, gauge means, means pivotally connecting the latter with saidframe means, means adjustably connecting said gauge means with said toolmeans, and means extending adjacent said acting auge last mentionedpivot .connection and through said adjustable means to shift said meansrelative to said tool means for determining the depth of operation ofthe latter irrespective of movement of said tool means relative to saidimplement means about its pivot connection therewith.

so. The combination with a cultivator having an implement frame, acultivator rig movably .ing the position of said gauging means relativeto said rig, said last mentioned means including rig upon furthermovement for raising both 31. An agricultural machine comprising atractor, tool means connected with the tractor for movement relativethereto, means serving as a bell crank mounted for rocking movementonthe tractor, means connected with onearm of said bell crank means forgauging the operating position of said tool means, and means connectedwith the other arm of said bell crank-means for -3l, furthercharacterized by hydraulic means driven from the tractor for rockingsaid bell crank means.

34. Anagricultural machine as defined in claim 31, further characterizedby hydraulicmeans driven from the tractor for'rocking 'said' bell crankmeans, and means for controlling said hydraulic means from the positionof said bell crank means.

35. An agricultural machine as defined in claim 31, furthercharacterized by said first mentioned connecting means includingconnections where-' v by when said second bell crank arm moves said toolmeans into an inoperative position said first said rig and said, gaugingmeans relative to said frame.

gausingmansrelativetoaidtodmans.

36. Anagrlculturalmachineah-actor, tool mans connectedwtih their-actorfor movement relative thereto, mans serving as a bell crank mountediorrocklng movement on the -toolmeans,mauseonnectedwlthonearmol,saidbellcrankmans-iorflreoperaflng.

connected position of said tool mans, mamwiththe-otherannoisaidbellerankmansfor'movingsaidtoolmansintoaninoperativeposition,andmeansonthetractoriorrockingsaidbell crankmans.

37. Anagriculturalmachinecomprlslngatractor, tool means connected withthe tractor tor movemmt relative thereto, a part mounted on the tractortor rocking-movement and laying two nal: ground caus wheel. meansswingably connecting the caus wheel with said tool mans, meansoperatively connecting one of saidsections with said swingable means forpositioning said-gauge wheel relativetosaidtoolmeans,andmamwherebytheother section moves said tool mans intoinoperative tion.

38. An agricultural machine comprising an implement frame, a cultivatorrig movably connected therewith, a gauging means movably connected withsaid rig, a rockabh mormted member having two sections, mans operativelyconnectingoneoisaidseciionswithsaidgauglngmeans for determining thedepth oi operation of said p -1 1 during movement ofsaid memberIorreturningsaidcontrollevertosaidneutral position to stop said member,and'means carby said controllever for adjusting the p0- of one of saidstops to advance or retard terminal position of said movable member. Ina hydraulic mechanism, the combinaot a pair of cooperativehydrauliccylinder audpiston members movable relative to each other, acontrol lever associated therewith and shiitable from a neutral positionto effect a relative t of said cylinder'and piston, stop mans movablewith one of said nmmbers relativeto said control lever to engage stopmeans carried by the latter and return said lever to a said neutralpositionto stop said members at a rlg,andmeanswherebymovementoisaidothersection raises said rig into its inoperative posi- -tion. a

39.-An agricultural machine comprising a tractor. a tool beam connectedtherewith for generally vertical swinging movement, a part movablyconnected with said tool beam, means mounted for rocking movement on thetractor and having two sections, mans connecting one 01' said sectionswith said part for positioning the latter relative to said tool beam,and means whereby the other section raises both said .tool means andsaid part into inoperative position,

\ said one section and its connection with said part serving to limitthe movement of the latter relativetosaidtoolmeanswhenthetoolmeans israised by said other section.

40. The combination set forth in claim 22, further characterised by theprovision of a pair of stops associated with said movable means and saidlever, respectively, and interengageableduringmovementotsaidtoolmeanstorreturning said control lever to said neutral position to stop said toolmeans, and means carried by said control lever for adjusting theposition clone of said stops to'advance or retard the terminal positionof said tool means.

41. The combination set forth in claim 22, further characterized by theprovision of a handle mounted on' said lever and optionally movablerelative thereto, stop means to said movable means, and cooperative stopmans connected to said handle and shift-able relative to said firstmentioned stop means by moving said handle relative to said lever,thereby changing the terminal position of said tool means.

42. In'a device of the clam described, the combination of a poweractuated movable member, a control lever associated therewith andshiftableirorn a neutral position to elect a movement of said pair oistops attached to said movable member member in a certain direction, a

certain terminal position, and means. carried by said lever foradlusting the podtions of the inu aw-1 stopmeans relative to said leverand said cooperative hydraulic members to adjustably determine theterminal position of the latter.

44. In a device, of the class described, the combination of a poweractuated movable member, a control element associated therewith andshiitable from a neutral position to eilect a movement of said member ina certain direction, a pair of interengageable stops, one of said stopsbeing emaciated with said control element and engageable with the otherof said stops to limitthe extent of movement of said member, a manuallyoperable lever connected with said control element, and an adjustingdevice mounted on said lever for adjusting the position of one of saidstops, thereby changing the terminal position of said member.

45. In a device of the class described, the combination of a poweractuated movable member, a manually operable control lever associatedtherewith and shiitable from a neutral position to dial; a movementofsaid member in a certain direction, a pair of interengageable stops,one of said stops being associated with said leverand engageable withthe other of said stops to limit the extent of movement of said member,and a handle movably mounted on said lever-and connected with one ofsaid stops for adjusting the position of the latter and thereby changingthe terminal position of said member. 46. In a device of the classdescribed, the combination of a power actuated movable member, amanually operable control lever associated therewith and shiitabl e froma neutral position to eitect a movement of'said member in a certaindirection, a handle mounted on said lever and optionally movablerelative thereto, stop means attached to said handle and operative toengage cooperative stop means to control the actuation of said lever andthus to limit the extent of movement of said power actuated member, saidstop means being shifts-hie by moving said handle, thereby changing theterminal position of said member.

$7. In a device of the class described, the combination of a poweractuated movable member,

'a manually operable control lever associated therewith and shiftablefrom a neutral position to eil'ect a movement of said member in acertain direction, a handle mounted on said lever and optionally movablerelative thereto, stop means on said member, and cooperative stop leverby moving said handles relative. to each other with said holding meansdisengaged, and a second stop means engageable with said shiftable 'stopmeans when said lever isout of said neutral position to limit the extentof movement of said member,

49. In a device of the class described, the combinationota poweractuated movable member, a control lever associated therewith andswingable from a neutral position to effect a movement of said member.in a certain direction,

said control lever comprising a pair of relatively. movable handlesmounted for swingin movement about 'an axis and disengageable means fornormally holding said handles together to swing as a unit, stop-meansattached to one of said handles and shiftable relative to said controllever by disengaging said holding means andmoving said one handlerelative to the other, and a second stop means connected to said memberand movable therewith into engagement with said shiftable stop means toreturn the lever to said neutral position to stop the movement of saidmember.

50. In hydraulic mechanism, the combination of a pair of cooperativecylinder and piston members movable relative to each other, a controllever j associated therewith and shiitable from a neutral position toeil'eci; a relative movement of said members in a certain direction, a

- handle mounted on said lever and movable relative thereto, means fornormally holding said handle in fixed position on saidlever for shiftingmovement therewith, stop means attached to said handle and shiftablerelative to said lever by moving said handle :with respect to thelatter, and a second stop means connected to one of said members andmovable therewith into engagement with said shiftable stop means to vreturn the lever to said neutral'position to stop the relative movementof said piston and cylinder members.

diseng'ageable means normally securing said levers together-to swing asa unit, and stop means attached to said power actuated member engageablewith said adjusting lever for returning said control lever. to saidneutral position.

52. In hydraulic mechanism, the combination of a pair 01 cooperativecylinder and piston members movable relative to each other, a valvecontrollever associated therewith pivotally supported to swing from aneutral position to effect a relative movementof said members in acertain direction, a limit adjusting lever pivotally connected withsaidcontrol lever and swingable relative thereto, a rack attached tosaid control lever and engageable with said adjusting lever to securesaid levers together for movement as a unit, a stop attached tosaidadjusting lever and shiftable thereby relative to said control lever,

- and a stop attached to one of said cylinder and position members andmovable thereby into engagement with said first stop for returning said'control lever to neutral position to stop the relative movement ofbers.

53. In hydraulic mechanism the combination of. a power actuated movablemember, a valve said cylinder and piston memcontrol lever associatedtherewith and pivotally supported to swing from a neutral position toeffect a movement of said member in'a certain direction, a limitadjusting lever pivotally supported adjacent said valve control lever toswing in a plane parallel to the plane of movement of said valve controllever, a rack attached to one of saidlevers and enga-geable with theother of said levers to secure said levers together for movementtogether, a stop attached to said adjusting lever and shiftabie therebyrelative to said valve control lever when the levers are disengaged fromeach other, and a stop attached to said movable member and movablethereby into engagement with said first stop for returning said valvecontrol lever to neutral position to stop the movement of said member.

54. In a motor vehicle having an operator's station including controlapparatus for said vehicle, the combination of an implement mountedseparate from the operator's station on said vehicle by means providingfor relative movement between the implement and tractor, power .liit'mechanism actuated by the vehicle motor for moving said implement, amanually operable control lever associated with said mechanism andpivotally supported at said operators station, said lever beingswingable from a neutral position to effect a movement of said powerlift mechanism to shift said implement in a certain direction, a pair ofinterengageable stops, one of said stops being associated with saidcontrol lever and engageable with the other'of said stops to limit themovement of said power lift mechanism to stop said implement in acertain terminal position relative to the vehicle, and a limit adjustinglever mounted at said operators station for adjusting the position ofone of said stops for adjustably determining said terminal position. l

55, In a motor vehicle having an operator's station including controlapparatus for said -vehicle, the combination of an implement mountedseparate from" the operator's station on said vehicle by means providingfor relative movement between the implement and tractor, power liftmechanism actuated by the vehicle motor for moving said implement, amanually operable control lever associated with said mechanism andpivotally supported at said operator's station, said lever beingswingable from a neutral position to eflect a movement of said powerlift mechanism to shift said implement in a certain direction, a Pair ofstop means conuected'with said control lever and said power-liftmechanism, respectively,

'and interengageable during movement of the latter to return saidcontrol lever to said neutral position when the implement is moved to apredetermined terminal position relative to the vehicle. and a limitadjusting lever pivotally mounted at said operator's station andconnected with one of said stop means to-adjust the point or engagementrelative to the working range of the power lift mechanism fordetermining the terminal position of said implement.

56. In a motor vehicle having an operators station including controlapparatus for said vehicle, the combination of an implement mountedseparate from the operator's station on said vehicle by means providingfor relative movement between the implement and tractor, hydraulic powerlift mechanism actuated by the vehicle a motor for moving saidimplement, a manually operable valve control handle associated with saidmechanism and supported at said operator's station, said handle beingmovable from a neutral position to eflect a movement of said power liftmechanism to shift said implement in a certain direction, alimitadiusting handle mounted at said operator's station adjacent saidvalve control handle and detachably connected thereto for movementtherewith but optionally movable independently oi the latter, stop meansattached to said limit adjusting handle and shiftable relative to saidcontrol handle by moving said limit adjusting handle independently ofsaid control handle, and a second stop means connected with said powerliit mechanism and engageable with said shittable stop means duringmovement of said power lift mechanism when said control handle is out ofsaid neutral position, to determine the terminal position of saidimplement relative to said tractor.

THEOPHILUS BROWN.

